1. Marx K.,
Capital
Vol I,
Penguin Books Ltd,
Harmondsworth
(1976).
2. Ostwald W.,
Energetische Grundlagen der Kulturwissenschaft
[Energetic Foundations of a Science of Culture],
Philosophical-Sociological Library,
ed. by
Ersler Rud.,
Vienna ,
Vol. XVI
W. Klinkhardt,
Leipzig
(1909).
3. Weber M.,
The Protestant Ethic and the Spirit of Capitalism,
Routledge,
London-New York
(2001)
(orig. ed 1905/20).